Labor and Delivery Practice Questions

Q: How is CPD (Cephalopelvic Disproportion) best assessed?

Clinical pelvic assessment. **Explanation:** Cephalopelvic Disproportion (CPD) occurs when there is a mismatch between the size of the fetal head and the maternal pelvic capacity, making vaginal delivery difficult or impossible. **Why Clinical Pelvic Assessment is the Correct Answer:** Clinical assessment remains the "gold standard" because CPD is a **functional diagnosis** that can often only be definitively confirmed during the trial of labor. Clinical pelvimetry (assessing the pelvic inlet, cavity, and outlet via vaginal examination) combined with the **Muller-Hillis maneuver** (to check for head engagement) allows for a dynamic evaluation. Unlike static imaging, clinical assessment accounts for the molding of the fetal head and the relaxation of pelvic ligaments during labor. **Why Other Options are Incorrect:** * **CT Scan & Radio pelvimetry (A & C):** While these provide precise bony measurements, they are poor predictors of actual labor outcomes. They cannot account for fetal head molding or the "give" of the pelvic joints. Furthermore, radiopelvimetry involves unnecessary ionizing radiation. * **Ultrasound (B):** USG is excellent for estimating fetal weight and head circumference (biometry), but it cannot accurately predict how that head will navigate the birth canal. **High-Yield Clinical Pearls for NEET-PG:** * **Muller-Hillis Maneuver:** The most common clinical method to assess CPD. If the head can be pushed into the pelvis without overriding the symphysis pubis, CPD is unlikely. * **Trial of Labor (TOL):** Indicated in mild to moderate degrees of suspected CPD (specifically in borderline contracted pelvis). It is contraindicated in major degrees of CPD. * **Diagnosis of Exclusion:** True CPD is often diagnosed retrospectively when labor fails to progress despite adequate uterine contractions (Power), favorable fetal position (Passenger), and no obvious pelvic deformity (Passage).

Q: Which of the following is a false statement regarding the anthropoid pelvis?

Ischial spines are prominent.. The **Anthropoid pelvis** is one of the four classic types of female pelves described by Caldwell and Moloy [1]. It is characterized by an oval-shaped inlet where the **anteroposterior (AP) diameter is greater than the transverse diameter**, resembling the pelvis of great apes [1]. ### Why the Correct Answer is Right: In an Anthropoid pelvis, the **ischial spines are typically blunt (not prominent)** [1]. Prominent or "encroaching" ischial spines are a hallmark feature of the **Android (masculine) pelvis**, which often leads to transverse arrest during labor. Therefore, the statement that ischial spines are prominent in an anthropoid pelvis is false. ### Analysis of Other Options: * **Option A:** True. The defining feature of the anthropoid pelvis is its long AP diameter and relatively narrow transverse diameter [1]. * **Option C:** True. The subpubic angle in an anthropoid pelvis is generally **wide or normal**, unlike the narrow, acute angle seen in the android pelvis [1]. * **Option D:** True. The sacrosciatic notch in the anthropoid pelvis is typically **large, shallow, and wide**, providing more posterior space [1]. ### NEET-PG High-Yield Pearls: * **Gynecoid:** Most common (50%); ideal for delivery; round inlet; wide subpubic angle. * **Android:** Heart-shaped inlet; prominent ischial spines; narrow subpubic angle; increased risk of instrumental delivery. * **Anthropoid:** Oval inlet (AP > Transverse); common in non-white races; associated with **occipito-posterior (OP) position** of the fetus [2]. * **Platypelloid:** Rarest; kidney-shaped inlet (Transverse > AP); flat pelvis.

Q: Arrest disorder is defined as the cessation of cervical dilatation in the active phase of labor of more than:

2 hours. **Explanation:** In modern obstetrics, labor abnormalities are categorized into **protraction disorders** (slow progress) and **arrest disorders** (complete cessation of progress). **1. Why Option D is Correct:** According to Friedman’s criteria, an **Arrest of Dilatation** is defined as the cessation of cervical dilatation for **2 hours or more** during the active phase of labor. For this diagnosis to be valid, the patient must have already entered the active phase (traditionally defined as ≥4 cm dilatation, though modern guidelines like Zhang’s often use 6 cm). This indicates a failure of the "power" (contractions), "passenger" (fetal size/position), or "passage" (pelvis). **2. Analysis of Incorrect Options:** * **Options A, B, and C:** These timeframes do not meet the diagnostic threshold for an arrest disorder. * **1.2 hours (Option B) and 1.5 hours (Option C)** are specific rates associated with **Protraction Disorders**. In the active phase, a primigravida should dilate at a rate of at least **1.2 cm/hr**, and a multigravida at **1.5 cm/hr**. If the rate is slower than this, it is "protraction," not "arrest." **3. NEET-PG High-Yield Pearls:** * **Arrest of Descent:** Failure of the fetal station to advance for **1 hour** or more. * **Active Phase definition:** While Friedman used 4 cm, the **WHO and ACOG** now define the start of the active phase at **6 cm** dilatation. * **Management:** Before diagnosing arrest in modern practice, ACOG recommends waiting for **4 hours** if contractions are adequate (measured via IUPC as >200 Montevideo units) or **6 hours** if contractions are inadequate and oxytocin is being used. * **Friedman’s Curve:** Remember that the active phase consists of the acceleration phase, phase of maximum slope, and deceleration phase. Arrest most commonly occurs during the phase of maximum slope.

Q: What is the commonest type of vertex presentation?

Left occipito transverse. **Explanation:** In vertex presentation, the position is determined by the relationship between the **occiput** (denominator) and the maternal pelvis. **Why Left Occipito-Transverse (LOT) is correct:** Statistically, **Left Occipito-Transverse (LOT)** is the most common initial position at the onset of labor. This is primarily due to the anatomical shape of the pelvic inlet. The transverse diameter of the pelvic inlet is wider than the anteroposterior diameter. Additionally, the presence of the sigmoid colon on the left side of the pelvis often pushes the occiput into a transverse or slightly anterior position. While many textbooks previously cited Left Occipito-Anterior (LOA) as the most common, modern obstetric studies and ultrasound data confirm that LOT is the most frequent starting position. **Analysis of Incorrect Options:** * **Left Occipito-Anterior (LOA):** This is the second most common position. It is often considered the "ideal" position for delivery, as the head is already partially rotated toward the symphysis pubis. * **Right Occipito-Anterior (ROA):** This occurs less frequently than LOA. The liver on the right side and the positioning of the descending colon on the left generally favor left-sided positions. * **Right Occipito-Posterior (ROP):** This is the most common **malposition** (not presentation). While it is the most frequent among posterior positions, it is significantly less common than LOT or LOA. **High-Yield Clinical Pearls for NEET-PG:** * **Most common position at onset of labor:** LOT. * **Most common malposition:** ROP (Right Occipito-Posterior). * **Most common mechanism of delivery:** The head usually enters in LOT, rotates 90° anteriorly during the second stage of labor to become Occipito-Anterior (OA) for delivery. * **Internal Rotation:** This occurs when the leading part (occiput) hits the pelvic floor and rotates toward the symphysis pubis.

Q: Deep transverse arrest is seen in all except?

Transverse lie. **Explanation:** **Deep Transverse Arrest (DTA)** occurs when the fetal head has descended to the level of the ischial spines (deep in the pelvic cavity) but fails to rotate from the occipito-transverse position to the occipito-anterior position. **Why "Transverse Lie" is the correct answer:** For DTA to occur, the fetus must be in a **longitudinal lie** with a cephalic presentation. In a **transverse lie**, the long axis of the fetus is perpendicular to the mother’s, and the presenting part is usually the shoulder. Since the head does not engage or descend into the pelvis in a transverse lie, the mechanism of "arrest of rotation" at the level of the spines is impossible. **Analysis of Incorrect Options:** * **Android Pelvis:** This is the most common cause of DTA. The narrow fore-pelvis and convergent side walls prevent the natural internal rotation of the fetal head. * **Epidural Analgesia:** It causes relaxation of the pelvic floor muscles (levator ani). Since the resistance of these muscles is essential for the fetal head to rotate, epidural anesthesia significantly increases the risk of DTA. * **Uterine Inertia:** Weak uterine contractions (secondary uterine inertia) provide insufficient force to push the fetal head against the pelvic floor, failing to facilitate internal rotation. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** Arrest of internal rotation at the level of the ischial spines for >1 hour. * **Pelvic Type:** Most common in **Android** and **Anthropoid** pelvis. * **Management:** If the pelvis is adequate and there is no CPD, it can be managed by **Manual Rotation** or **Kielland’s Forceps**. If these fail or CPD is present, **Cesarean Section** is the definitive treatment. * **Prerequisite:** The head must be engaged for DTA to be diagnosed.

Q: What is the most common cause of an occipitoposterior presentation?

Android pelvis. **Explanation:** The **Android pelvis** (masculine type) is the most common predisposing factor for an **Occipitoposterior (OP) position**. In an android pelvis, the forepelvis is narrow and triangular, while the hindpelvis is shallow. This anatomical configuration prevents the wide occiput from fitting into the narrow anterior segment of the pelvis, forcing it to occupy the more spacious posterior segment (sacroiliac notch), resulting in an OP presentation. **Analysis of Options:** * **Android Pelvis (Correct):** It is the most common cause. Additionally, the **Anthropoid pelvis** is also strongly associated with OP positions because its long anteroposterior diameter favors the head engaging in the AP diameter of the inlet. * **Deflexed Head:** While a deflexed head is a *characteristic feature* of an OP position (due to the opposition of the diameters), it is generally considered a **consequence** of the position rather than the primary cause. * **Gynecoid Pelvis:** This is the normal female pelvis. It favors the Occipito-anterior (OA) position because the forepelvis is roomy enough to accommodate the occiput. * **Multiparity:** Multiparity usually leads to a lax abdominal wall, which more commonly predisposes to transverse lies or malpresentations rather than specifically an OP position. **High-Yield Clinical Pearls for NEET-PG:** * **Most common malposition:** Occipitoposterior (Right OP is more common than Left OP). * **"Face-to-Pubes":** This refers to a persistent OP position where the baby is born with the face looking upward. * **Clinical Sign:** On abdominal examination, you find a "flattening" of the maternal abdomen below the umbilicus and easily palpable fetal limbs anteriorly. * **Labor Pattern:** OP positions are associated with "backward labor" (severe back pain) and a prolonged second stage of labor.

Q: What is the maximum dose of PGE2 cervical gel for cervical ripening in 24 hours?

1-5 mg. **Explanation:** **1. Why the Correct Answer is Right:** PGE2 (Dinoprostone) cervical gel is a gold-standard pharmacological agent used for cervical ripening in patients with an unfavorable Bishop score. The standard dose is **0.5 mg** (contained in a 2.5 ml syringe) administered endocervically. According to standard obstetric protocols (including Williams Obstetrics and ACOG guidelines), this dose can be repeated every 6–12 hours if there is no adequate cervical change or uterine activity. The **maximum cumulative dose recommended within a 24-hour period is 1.5 mg** (3 doses). Therefore, the range **1.5 mg** (often rounded or represented as 1-1.5 mg in various texts) is the clinical limit to prevent uterine tachysystole. **2. Analysis of Incorrect Options:** * **A (2 mg):** This exceeds the standard 24-hour limit for the *gel* formulation (though 2 mg is the starting dose for the *vaginal suppository* formulation). * **B (1 mg):** This represents only two doses; while safe, it is not the *maximum* allowable limit. * **D (4 mg):** This is a dangerously high dose for PGE2 gel and significantly increases the risk of uterine rupture and fetal distress. **3. High-Yield Clinical Pearls for NEET-PG:** * **Bishop Score:** Cervical ripening is indicated when the Bishop score is **≤ 6**. * **The "Wait Time":** After the last dose of PGE2 gel, you must wait at least **6–12 hours** before starting Oxytocin to avoid synergistic uterine hyperstimulation. * **Contraindications:** Avoid PGE2 in patients with a previous cesarean section or major uterine surgery due to the high risk of **uterine rupture**. * **Storage:** Dinoprostone gel must be stored in a refrigerator (2°C to 8°C). * **Side Effect:** The most common side effect is **uterine tachysystole** (>5 contractions in 10 minutes).

Q: What is the danger of internal podalic version in obstructed labor?

Rupture of lower uterine segment. **Explanation:** In **obstructed labor**, the uterus is divided into two distinct zones: the upper uterine segment becomes thick and retracted, while the **lower uterine segment (LUS)** becomes pathologically thinned out and stretched to its limit. At this stage, a **Bandl’s ring** (pathological retraction ring) often forms at the junction. **Internal Podalic Version (IPV)** is a high-risk obstetric maneuver where the clinician reaches into the uterus to grasp the feet and turn the fetus. In the setting of obstructed labor, the liquor is usually drained, and the uterus is tightly "wrapped" around the fetus (tonic contraction). Any intrauterine manipulation—especially IPV—increases the tension on the already paper-thin, overstretched lower uterine segment, leading to an immediate and catastrophic **rupture of the lower uterine segment**. **Analysis of Incorrect Options:** * **Perineal and Cervical Tears (A & B):** While these can occur during difficult instrumental deliveries or breech extractions, they are not the primary "danger" or life-threatening complication associated with IPV in obstructed labor. * **Rupture of Upper Uterine Segment (D):** During labor, the upper segment is thick, muscular, and active. It is physiologically resistant to stretching. Rupture here is rare and usually associated with previous classical C-section scars, not the mechanical stress of IPV. **NEET-PG High-Yield Pearls:** * **Absolute Contraindication:** Obstructed labor is an absolute contraindication for Internal Podalic Version. * **Current Indication:** Today, IPV is almost exclusively reserved for the delivery of a **second twin** (non-vertex presentation). * **Bandl’s Ring:** Its presence is a clinical warning sign of impending rupture of the lower uterine segment. * **Management:** The treatment of choice for obstructed labor is always a **Cesarean Section**, never a version or instrumental delivery.

Q: What is the latent period in a primigravida?

6 to 8 hours. **Explanation:** The **latent phase** is the initial part of the first stage of labor, characterized by the onset of regular uterine contractions and cervical effacement, ending when the cervix reaches approximately 4–6 cm dilation. **Why Option B is Correct:** In a **primigravida**, the average duration of the latent phase is approximately **6 to 8 hours**. While the Friedman curve traditionally suggests a mean of 8.6 hours, standard clinical textbooks (like Williams Obstetrics and Dutta) define the normal range for primigravidas as 6–8 hours. In contrast, for multiparous women, this phase is shorter, typically lasting 4–5 hours. **Analysis of Incorrect Options:** * **Option A (2 hours):** This is too short for a primigravida. Such a rapid duration would be more characteristic of the active phase in a multiparous woman or a precipitous labor. * **Option C (10 to 12 hours):** While the latent phase can occasionally last this long, it is not the "average" or standard duration used for examination purposes. * **Option D (14 to 16 hours):** This duration approaches the definition of a **Prolonged Latent Phase**. According to Friedman’s criteria, a latent phase is considered prolonged if it exceeds **20 hours** in a primigravida or **14 hours** in a multipara. **High-Yield Clinical Pearls for NEET-PG:** * **Prolonged Latent Phase:** Most commonly caused by an unripe cervix, excessive sedation, or false labor. The management of choice is usually **therapeutic rest** (morphine) or oxytocin augmentation. * **Cervical Dilation Rate:** In the active phase, the minimum rate of dilation should be **1.2 cm/hr** for primigravidas and **1.5 cm/hr** for multiparas. * **Friedman vs. WHO:** While Friedman defined the active phase starting at 3–4 cm, the WHO and recent ACOG guidelines now suggest the active phase begins at **6 cm**.

Question 1

How is CPD (Cephalopelvic Disproportion) best assessed?

Accepted Answer

Clinical pelvic assessment

Answer

CT scan

Answer

Ultrasound

Answer

Radio pelvimetry

Question 2

Which of the following is a false statement regarding the anthropoid pelvis?

Accepted Answer

Ischial spines are prominent.

Answer

Anteroposterior diameter is greater than the transverse diameter.

Answer

Subpubic angle is wide.

Answer

Sacrosciatic notch is shallow and wide.

Question 3

Arrest disorder is defined as the cessation of cervical dilatation in the active phase of labor of more than:

Accepted Answer

2 hours

Answer

1 hour

Answer

1.2 hours

Answer

1.5 hours

Question 4

What is the commonest type of vertex presentation?

Accepted Answer

Left occipito transverse

Answer

Left occipito anterior

Answer

Right occipito anterior

Answer

Right occipito posterior

Question 5

Deep transverse arrest is seen in all except?

Accepted Answer

Transverse lie

Answer

Android pelvis

Answer

Epidural analgesia

Answer

Uterine inertia

Question 6

What is the most common cause of an occipitoposterior presentation?

Accepted Answer

Android pelvis

Answer

Deflexed head

Answer

Gynecoid pelvis

Answer

Multiparity

Question 7

What is the maximum dose of PGE2 cervical gel for cervical ripening in 24 hours?

Accepted Answer

1-5 mg

Answer

2 mg

Answer

1 mg

Answer

4 mg

Question 8

What is the danger of internal podalic version in obstructed labor?

Accepted Answer

Rupture of lower uterine segment

Answer

Perineal tear

Answer

Cervical tear

Answer

Rupture of upper uterine segment

Question 9

A second para is admitted in advanced labor at 40 weeks of amenorrhea. She has a single fetus in transverse lie, and the fetal heart beat is absent. On vaginal examination, the cervix is fully dilated and the presenting part is a shoulder. What is the most appropriate management?

Accepted Answer

Perform a cesarean section immediately

Answer

Await spontaneous delivery of the dead fetus

Answer

Perform a decapitation operation

Answer

Perform an external cephalic version

Question 10

What is the latent period in a primigravida?

Accepted Answer

6 to 8 hours

Answer

2 hours

Answer

10 to 12 hours

Answer

14 to 16 hours

Labor and Delivery — MCQs

Labor and Delivery — MCQs

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